from datetime import datetime

from flask import render_template, flash, redirect, url_for, request
from flask_login import current_user, login_user, logout_user, login_required
from werkzeug.urls import url_parse

from app import app, login, db
from app.forms import LoginForm, RegistrationForm, EditProfileForm, PostForm
from app.models import User, Post

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'''
这个文件是视图内容，负责能直接看到的一部分内容
'''


app.config['SECRET_KEY'] = 'you-will-never-guess'


@login.user_loader
def load_user(id):
    return User.query.get(int(id))


#主页
@app.route('/', methods=['GET', 'POST'])
@app.route('/index', methods=['GET', 'POST'])
@login_required
def index():
    form = PostForm()
    if form.validate_on_submit():
        post = Post(body=form.post.data, author=current_user)
        db.session.add(post)
        db.session.commit()
        flash('It alive!It alive!!')
        return redirect(url_for('index'))
    posts = current_user.followed_posts().all()
    return render_template("index.html", title='主页', form=form, posts=posts)


# 登录
@app.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.check_password(form.password.data):
            flash('用户名或密码错误')
            return redirect(url_for('login'))
        login_user(user, remember=form.remember_me.data)
        next_page = request.args.get('next')
        if not next_page or url_parse(next_page).netloc != '':
            next_page = url_for('index')
        return redirect(next_page)
    return render_template('login.html', title='Sign In', form=form)


# 登出
@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))


# 注册
@app.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        user.password = form.password.data
        db.session.add(user)
        db.session.commit()
        flash('恭喜你，你已经是尊贵的会员了！')
        return redirect(url_for('login'))
    return render_template('register.html', title='Register', form=form)


# 用户
@app.route('/use/<username>')
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    posts = [
        {'author': user, 'body:': 'Test post #1'},
        {'author': user, 'body:': 'Test post #2'}
    ]
    return render_template('user.html', user=user, posts=posts)


@app.before_request
def before_request():
    if current_user.is_authenticated:
        current_user.last_seen = datetime.utcnow()
        db.session.commit()


# 编辑个人资料
@app.route('/edit_profile', methods=['GET', 'POST'])
@login_required
def edit_profile():
    form = EditProfileForm(current_user.username)
    if form.validate_on_submit():
        current_user.username = form.username.data
        current_user.about_me = form.about_me.data
        db.session.commit()
        flash('您的修改已保存')
        return redirect(url_for('index'))
    elif request.method == 'GET':
        form.username.data = current_user.username
        form.about_me.data = current_user.about_me
    return render_template('edit_profile.html', title='Edit Profile', form=form)

@app.route('/follow/<username>')
@login_required
def follow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash('没有找到{}'.format(username))
        return redirect(url_for('index'))
    if user == current_user:
        flash('你不能关注你自己')
        return redirect(url_for('user', username=username))
    current_user.follow(user)
    db.session.commit()
    flash('You are following {}!'.format(username))
    return redirect(url_for('user', username=username))

@app.route('/unfollow/<username>')
@login_required
def unfollow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash('没有找到{}'.format(username))
        return redirect(url_for('index'))
    if user == current_user:
        flash('你不能取消关注你自己')
        return redirect(url_for('user', username=username))
    current_user.unfollow(user)
    db.session.commit()
    flash('You are following {}!'.format(username))
    return redirect(url_for('user', username=username))

@app.route('/explore')
@login_required
def explore():
    posts = Post.query.order_by(Post.timestamp.desc()).all()
    return render_template('index.html', title='Explore', posts=posts)
